Avoid leaking SerializedHandles.

content/browser/renderer_host/pepper/pepper_gamepad_host.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/pepper/pepper_gamepad_host.h"
 
 #include "base/bind.h"
 #include "content/browser/gamepad/gamepad_service.h"
 #include "content/public/browser/browser_ppapi_host.h"
 #include "ppapi/c/pp_errors.h"
@@ skipping 53 matching lines @@
   // gamepad. This is to prevent fingerprinting and matches what the web
   // platform does.
   gamepad_service_->RegisterForUserGesture(
       base::Bind(&PepperGamepadHost::GotUserGesture,
                  weak_factory_.GetWeakPtr(),
                  context->MakeReplyMessageContext()));
   return PP_OK_COMPLETIONPENDING;
 }
 
 void PepperGamepadHost::GotUserGesture(
-    const ppapi::host::ReplyMessageContext& in_context) {
+    const ppapi::host::ReplyMessageContext& context) {
   base::SharedMemoryHandle handle =
       gamepad_service_->GetSharedMemoryHandleForProcess(
           browser_ppapi_host_->GetPluginProcessHandle());
 
-  // The shared memory handle is sent in the params struct
-  // (in the reply context), so we have to make a copy to mutate it.
-  ppapi::host::ReplyMessageContext context = in_context;
   context.params.AppendHandle(ppapi::proxy::SerializedHandle(
       handle, sizeof(ppapi::ContentGamepadHardwareBuffer)));
   host()->SendReply(context, PpapiPluginMsg_Gamepad_SendMemory());
 }
 
 }  // namespace content